Re: Cable Modems (was Re: Telewest Communications FIASCO)

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Article #34

#34

From: Stuart Carmichael
Date: Fri, 21 Feb 1997 00:00

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phil henry wrote:
> 
> On Thu, 20 Feb 1997 19:24:41 GMT, Peter@adelheid.demon.co.uk (Peter G.
> Strangman) wrote:
> 
> >On Thu, 20 Feb 1997 14:43:23 GMT, phil.henry@telcore.demon.co.uk (phil
> >henry) wrote:
> >
> >> An aside: xDSL technologies can put 2-8Mb/s down copper.
> >>
> >> However, cable modems won't be on the end of copper.
> >
> >Eh? What will they be on then?
> 
> Not copper pairs. I believe they will use coax although fibre is
> possible.
> 
> --
> ________________________________________________________
> phil henry ...

The whole point of ADSL is that it does use the existing copper 
pairs that the telcos have already installed.  This means that 
to roll out ADSL they don't have to relay all the cables to your 
home, just stick an ADSL modem on each end of the cable (one in 
your home and one in the local exchange).  The other thing to note
is that it is Aysmetric, i.e ~6Meg down stream (depending on 
cable quality/length) for all those lovely web pages and 640k 
upstream for control information. Asymetric signalling gives you
better bandwidth because you have reduced crosstalk between the 
pairs.

if you want more info on this check out 
http://www.adsl.com/adsl_tutorial.html

stu

--
In case you haven't guessed the opinions expressed here are my own
and have no reflection on my employer.

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<Pine.SUN.3.95.970218210422.12679B-100000@k9.tardis.ed.ac.uk> <dam-1902971353310001@kerrera.dcs.gla.ac.uk> <Pine.SOL.3.95.970219173112.9188A-100000@lanner.dai.ed.ac.uk> <Pine.SUN.3.95.970220121654.24605B-100000@tardis.tardis.ed.ac.uk> <E5wMyy.I7w.0.staffin.dcs.ed.ac.uk@dcs.ed.ac.uk> <330c6189.25450463@news.demon.co.uk> <330d9bcc.89825113@news.demon.co.uk> <330d51e5.3876892@news.demon.co.uk>

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From: Stuart Carmichael <stuartc@europe.shiva.com>
Subject: Re: Cable Modems (was Re: Telewest Communications FIASCO)
Date: 1997/02/21
Message-ID: <330D6C52.2D61@europe.shiva.com>
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